Chem 1LD Exam Ques ons an answers | Updated RATED
A+ | NEW 2026
The most probably lab emergencies are chemical spills, etc. Which of the following statements
are TRUE about responding to emergencies?
A. Stay calm
B. All labs must have 2 exits
C. Know where the stairwells are
D. If possible turn off lab equipment before leaving lab for fire alarm.
All of the above
Which of the following common household products contain flammable chemicals?
A. Gasoline
B. An-freeze
C. Bleach
D. Rubbing alcohol
E. Nail polish remover
F. Liquid hand soap
A, b, d, e
Which of the following are ways to stop a fire?
A. Remove igni-on sources
B. Limit quan--es of flammable substances in work area.
C. Place beaker over a small flame to remove oxygen
D. Ground metal container to prevent sta-c electricity
All of the above
Which of the following statements are true about flammability?
A. A fire can't start above or below a vapor's flammability limits.
B. Inflammable is another word for flammable.
C. The boiling point of a flammable liquid is usually high
d. Flammable chemicals can be liquids or solids, gases don't burn
E. All vola-le chemical are flammable
F. Combus-ble are the same as flammable
, A, B
The Na-onal fire protec-on associa-on (NFPA) diamond has a BLANK sec-on for flammability. If
the number BLANK appears in this sec-on, the chemical is extremely flammable. If the number
BLANK appears in this sec-on, the chemical is a combus-ble, it will catch on fire when heated.
Red, 4, 2
The Global Harmonized system (GHS) symbol is a pic of a BLANK. If the hazard category is
BLANK, the chemical is extremely flammable. If the hazard category is BLANK, the chemical is a
combus-ble.
Fire, HC 1, HC 4
Which of the following is true about fume hoods?
A. Room air should be drawn into fume hood.
B. The window on front of fume hood is called a stash.
C. All work should be done at least 6 inches inside the hood.
D. A -ssue paper held at the bo;om of a sash should blow into the hood.
E. A fume hood has it's own power. It's okay to con-nue work if the power fails.
F. Exhaust air from fume hoods is recycled back through lab.
A, b, c, d,
PEL
Permissible Exposure Limit
Odor Threshold
Gas concentra-on that 50
odor fa-gue
Decreased sensi-vity to odor a?er some exposure -me
IDLH
Immediately Dangerous to Life and Health
OEL
Occupa-onal Exposure Limit
Which of these chemicals will you smell AFTER it becomes hazardous?
A. Hexane: 50ppm (PEL), 130ppm (odor threshold)
B. Dicholoromethane: 25ppm (PEL), 130ppm (odor threshold)
A+ | NEW 2026
The most probably lab emergencies are chemical spills, etc. Which of the following statements
are TRUE about responding to emergencies?
A. Stay calm
B. All labs must have 2 exits
C. Know where the stairwells are
D. If possible turn off lab equipment before leaving lab for fire alarm.
All of the above
Which of the following common household products contain flammable chemicals?
A. Gasoline
B. An-freeze
C. Bleach
D. Rubbing alcohol
E. Nail polish remover
F. Liquid hand soap
A, b, d, e
Which of the following are ways to stop a fire?
A. Remove igni-on sources
B. Limit quan--es of flammable substances in work area.
C. Place beaker over a small flame to remove oxygen
D. Ground metal container to prevent sta-c electricity
All of the above
Which of the following statements are true about flammability?
A. A fire can't start above or below a vapor's flammability limits.
B. Inflammable is another word for flammable.
C. The boiling point of a flammable liquid is usually high
d. Flammable chemicals can be liquids or solids, gases don't burn
E. All vola-le chemical are flammable
F. Combus-ble are the same as flammable
, A, B
The Na-onal fire protec-on associa-on (NFPA) diamond has a BLANK sec-on for flammability. If
the number BLANK appears in this sec-on, the chemical is extremely flammable. If the number
BLANK appears in this sec-on, the chemical is a combus-ble, it will catch on fire when heated.
Red, 4, 2
The Global Harmonized system (GHS) symbol is a pic of a BLANK. If the hazard category is
BLANK, the chemical is extremely flammable. If the hazard category is BLANK, the chemical is a
combus-ble.
Fire, HC 1, HC 4
Which of the following is true about fume hoods?
A. Room air should be drawn into fume hood.
B. The window on front of fume hood is called a stash.
C. All work should be done at least 6 inches inside the hood.
D. A -ssue paper held at the bo;om of a sash should blow into the hood.
E. A fume hood has it's own power. It's okay to con-nue work if the power fails.
F. Exhaust air from fume hoods is recycled back through lab.
A, b, c, d,
PEL
Permissible Exposure Limit
Odor Threshold
Gas concentra-on that 50
odor fa-gue
Decreased sensi-vity to odor a?er some exposure -me
IDLH
Immediately Dangerous to Life and Health
OEL
Occupa-onal Exposure Limit
Which of these chemicals will you smell AFTER it becomes hazardous?
A. Hexane: 50ppm (PEL), 130ppm (odor threshold)
B. Dicholoromethane: 25ppm (PEL), 130ppm (odor threshold)
